Frowy, an adjective used to describe something that smells stale, damp, or stuffy, is often associated with poorly ventilated rooms or clothing that has been left out for too long. Fortunately, there are several synonyms that can be used to describe this unpleasant odor. Some possible synonyms for frowy include musty, moldy, rancid, stale, or dank. Each of these words conveys a similar sense of unpleasantness and dampness that is often associated with poorly aired spaces. When describing a space or object that emits a foul odor, it's important to use specific vocabulary that accurately conveys the nature of the smell.